Designing and Constructing the Transmission Line
A variety of transmission line structure designs may be used for the project. The structures may be a combination of single and double circuit towers and steel lattice and tubular steel towers.
Idaho Power follows all applicable safety codes and standards to ensure our systems operate safely and reliably. The National Electric Safety Code (NESC) is the industry–accepted safety standard which guides the design, installation, operation and maintenance of transmission lines and equipment.
The approximate proposed design standards are listed below.
Tower footprint: 40 by 40 feet
Span length: (average): 1,100 to 1,200 feet
Ground clearance: (average): 35 feet
Right of way width: 250 feet
If the federal and state agencies approve a transmission line route, Idaho Power will work with affected property owners to determine the exact line location and identify opportunities to reduce impacts to the property. Visit our People and Power Lines section for more information.
Construction of the proposed transmission line would begin after Idaho Power receives permits from BLM and USFS, and an Energy Facility Site Certificate from ODOE-EFSC.
Constructing a transmission line is a big undertaking, which includes building access roads and towers, stringing lines and restoring disturbed lands. Idaho Power will oversee all transmission line and substation design and construction, and contract with construction companies to build the line.
Idaho Power will conform to all state and federal siting requirements when siting the line. Additionally, all applicable safety codes and standards will be followed to ensure our system operates safely and reliably.
The sequence for general transmission line construction is described below.
Building access roads and site preparation
Installing tower foundations
Assembling the structure
Stringing the line
Restoring and re-vegetating disturbed lands
This website is the joint Boardman to Hemingway Transmission Line Project site. Information contained on this site is approved for posting by Idaho Power. Visit the Idaho Power website.